Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57a7158aff46a09…

MALICIOUS

PDF

71.2 KB Created: 2021-09-21 22:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e19e08c7854ae906d96549fdef991828 SHA-1: 6a9b607c8c691e4776208f83f9a848a76ffc2f0b SHA-256: b57a7158aff46a096e162da43c04622edb89793ad05cbdfc6b19c2958803f69e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s6oc61c295o7gekta7hd81gn2t/29744962806.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380ef8f3097---xolizejufakikav.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/jigixolidid.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8731902276.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/54553639112.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/20839150110.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vefofigavokuvukefu.pdfIn PDF document text
    • https://trexanh.net/upload/files/xexasefevalodigavameg.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tewukizazoti.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/wifunivivavatuxiwosojej.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/11077234449.pdfIn PDF document text
    • http://fruitvita.com/files/files/pezijunono.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161315a4363549---82914618660.pdfIn PDF document text
    • https://aksusu.com/upload/files/pifimunonuwin.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/85383670035.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zenilumite.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/42190278644.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/gagij.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/29492150209.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/30840718856.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133057555233---91980448627.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/2245294945.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631193536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+mod+apk+zombie+catchersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 15752 bytes
SHA-256: 0f3428cf4591aa84e84a0830a6248c8724d199b6c26dbe0d5aa4535c053997e4
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 11156 bytes
SHA-256: 9c024c892efa7a96b819b7948c60ab250230c546c13b7601a53d67565c76a6cc
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1